On heating calcium carbonate gets converted into calcium oxide and carbon dioxide.
(a) Is this a physical or chemical change?
(b) Can you prepare one acidic and one basic solution by using the products formed in the above process? If so, write the chemical equation involved.

Explanation

(a) It is chemical change. The chemical equation for the reaction is :
calcium carbonate `overset("heat")rarr` Calcium oxide + Carbon dioxide
(b) By adding water to calcium oxide taken in a test tube, a basic solution results. It contains calcium hydroxide
Calcium oxide + Water `rarr` Calcium hydroxide
By passing carbon dioxide through water taken in a tube, carbonic acid is formed. The solution is of acidic nature
Carbon dioxide + Water `rarr` Carbonic acid
Notes : All the three chemical equations are word equations. Symbol equations can also be written for these. For example,
`CaCO_(3) overset("heat")rarr CaO + CO_(2)`
`CaO + H_(2)O rarrCa(OH)_(2)` (basic solution)
`CO_(2) + H_(2)O rarr H_(2)CO_(3)` (acidic solution)
However, you will learn about these in the next class.